Temperature measurements of binary droplets using three-color laser-induced fluorescence

Maqua, C.; Castanet, Guillaume; Lemoine, Fabrice; Doué, Nicolas; Lavergne, G.

doi:10.1007/s00348-006-0116-y

Cited by 33 publications

(21 citation statements)

References 21 publications

(27 reference statements)

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“…The twocolor laser-induced fluorescence (2cLIF) was developed specifically to measure the temperature of single-component droplets in either inert or reactive flows (Lavieille et al 2001). It was also extended to handle the case of multi-component droplets (Deprédurand et al 2008;Maqua et al 2006). This method is a two-color one-singledye approach, i.e., the emissions from two different spectral bands with different temperature sensitivities are used.…”

Section: Introductionmentioning

confidence: 99%

A two-color planar LIF technique to map the temperature of droplets impinging onto a heated wall

Dunand¹,

Castanet²,

Lemoine³

2011

Exp Fluids

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This work consists in the development of the planar extension of two-color LIF, usually working as a point-wise technique. This latter has already demonstrated its ability to characterize the temperature of droplets in various situations including droplet evaporation in combusting flows or droplet/wall interactions in the case of point-wise measurements. This technique is based on the measurement of the relative intensity detected on two adequate spectral bands of a single fluorescent tracer. It allows absolute temperature measurement when a reference at a given temperature is known. The two-color LIF system is designed for observing single drop impacts onto a hot wall with a field of view limited to a few square millimeter. In this study, the focus is placed first on the description of the technique development: the selection of a suitable tracer, its temperature calibration, the correction for the non-linearity of the response of the measurement system, and the pixel-by-pixel correspondence of the camera images. After several tests carried out on droplets in temperature-controlled conditions, the feasibility of the method is finally demonstrated in the case of droplets impinging on a heated wall for different impact regimes: rebound, splashing, and deposition of a boiling liquid film.

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Section: Introductionmentioning

confidence: 99%

A two-color planar LIF technique to map the temperature of droplets impinging onto a heated wall

Dunand¹,

Castanet²,

Lemoine³

2011

Exp Fluids

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“…If nothing is done to take into account the effect of the fuel composition, significant errors in the temperature measurements may be committed. Maqua et al (2006) 2 0 4 0 6 0 8 0 isohexane n-dodécane n-dodécane 25% / isohexane 75% n-dodécane 50% / isohexane 50% n-dodécane 75% / isohexane 25% n-dodécane 75% / n-heptane 25% n-dodécane 50% / n-heptane 50% n-dodécane 25% / n-heptane 75% n-heptane n-dodécane detecting the signal on a third spectral band having intermediate sensitivities to both composition and temperature. Instead, the change in droplet composition will be estimated from the reduction in the droplet size in the case of binary mixtures made of fuels having very different volatilities.…”

Section: Temperature Measurements In Mixturesmentioning

confidence: 99%

Characterization of the evaporation of interacting droplets using combined optical techniques

2015

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“…This comes essentially from the Gaussian distribution of the energy in the laser beams and the refraction at the droplet surface (see [17] for details). This effect can be safely ignored in the case of droplets significantly smaller than the probe volume.…”

Section: Two-colour Laser Induced Fluorescence Thermometrymentioning

confidence: 99%

“…Ethanol and acetone fuels were chosen for the experimental study since these fuels have rather different volatilities. The spectroscopic properties of the mixture of ethanol and acetone were characterized in a previous study [17]. The space-averaged temperature of the droplets was measured using the two-colour laser induced fluorescence technique.…”

Section: Introductionmentioning

confidence: 99%

Monodisperse droplet heating and evaporation: Experimental study and modelling

Maqua

Castanet

Grisch

et al. 2008

International Journal of Heat and Mass Transfer

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Results of experimental studies and the modelling of heating and evaporation of monodisperse ethanol and acetone droplets in two regimes are presented. Firstly, pure heating and evaporation of droplets in a flow of air of prescribed temperature are considered. Secondly, droplet heating and evaporation in a flame produced by previously injected combusting droplets are studied. The phase Doppler anemometry technique is used for droplet velocity and size measurements. Two-colour laser induced fluorescence thermometry is used to estimate droplet temperatures. The experiments have been performed for various distances between droplets and various initial droplet radii and velocities. The experimental data have been compared with the results of modelling, based on given gas temperatures, measured by coherent anti-stokes Raman spectroscopy, and Nusselt and Sherwood numbers calculated using measured values of droplet relative velocities. When estimating the latter numbers the finite distance between droplets was taken into account. The model is based on the assumption that droplets are spherically symmetrical, but takes into account the radial distribution of temperature inside droplets. It is pointed out that for relatively small droplets (initial radii about 65 lm) the experimentally measured droplet temperatures are close to the predicted average droplet temperatures, while for larger droplets (initial radii about 120 lm) the experimentally measured droplet temperatures are close to the temperatures predicted at the centre of the droplets.

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Temperature measurements of binary droplets using three-color laser-induced fluorescence

Cited by 33 publications

References 21 publications

A two-color planar LIF technique to map the temperature of droplets impinging onto a heated wall

A two-color planar LIF technique to map the temperature of droplets impinging onto a heated wall

Characterization of the evaporation of interacting droplets using combined optical techniques

Monodisperse droplet heating and evaporation: Experimental study and modelling

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